function add(a, b) {
    return a + b;
}

let sub = function (a, b) {
    return a - b;
};
console.log(function (a, b) {
    return a * b;

}(3, 4));


let mul = (a, b) => {
    return a * b;
};
let div = (a, b) => a / b;

console.log(div(13, 4));

let sq = (x) => x * x;

console.log(Math.floor(div(13, 4)));

let a=[1,2,3,4,5];
console.log(a.map(x=>x*x));